就像电感式传感器一样，电容式传感器检测目标物也是非接触式的。电容式传感器既能检测导电性材料同时又能检测非导电性材料，然而我们通常用于检测塑料，液体，粉末状和粒状物等非电导性材料物体。

在实际应用中，电容式接近开关的灵敏度取决于被检目标物的材料特性。比如金属，塑料或者液体等目标物的材料特性会影响电容式传感器的感应距离，因而被检测到的动作点也会各不相同。考虑到这些材料不同引起的差异，倍加福提供很多产品都是可调灵敏度的，从而使这些传感器在实际应用中变得更加灵活。

在某些电感式传感器不适用的应用场合，这些电容式的传感器就是您的另一种可选方案。

Palm buttons offer an ergonomic alternative to mechanical push buttons. Operators using ergonomic safety palm buttons can dramatically reduce the risk of repetitive motion injuries, since the palm buttons need only a light touch to activate.  Some palm button models can even sense the operator's hands through heavy gloves!
 
These capacitive palm buttons are designed for use with standard two-hand machine control, are immune to most radio frequency interference, and offer continual self-checking electronics.  Redundant output relays with one way guided contacts ensure reliable operation The palm buttons are UL listed with U.S. and Canadian standards.
 
Palm button assemblies include:

• Cover plate & gasket
• Hub box & ring guard
• Hub box & u-channel guard
• FS box assembly (optional)